Surface‐Area Determination of Kaolinite Using Glycerol Adsorption

Woodside, K. H.; Ormsby, W. C.

doi:10.1111/j.1151-2916.1960.tb13638.x

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…The adsorption values corresponding to unimolecular surface coverage for OP, BP, and Q were obtained by the application of the usual Langmuir treatment, and for glycerol by heating a clay glycerol mixture in the presence of a partially saturated atmosphere of glycerol vapor until adsorption equilibrium was attained (9). For the EG the equilibrium procedure described by Eltantawy and Arnold (10, 11) was adopted, using an evacuated system containing a free liquid surface and dry CaCl 2 as a separate phase.…”

Section: Methodsmentioning

confidence: 99%

Monolayer Coverage–Sorbate Area Relationship for Mixtures of Sorbents

Helmy

Bussetti

Ferreiro

1999

Journal of Colloid and Interface Science

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Section: Methodsmentioning

confidence: 99%

Monolayer Coverage–Sorbate Area Relationship for Mixtures of Sorbents

Helmy

Bussetti

Ferreiro

1999

Journal of Colloid and Interface Science

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“…It is therefore impossible to assign a single area to the adsorbed olar molecule when working with the mixed mineral assemblies foun dp in most soils. T h e use of olar molecules may, however, be successful when ap lied to same material oodside and Ormsby, 1960). When used with soils and a 'characteristic index' (Dyal and Hendricks, 1950) or 'retention value' (Martin, 1955) related to the specific surface area.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Total Specific Surfaceareas of Soils by Adsorption of Cetyl Pyridinium Bromide

Greenland

Quirk

1964

Journal of Soil Science

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Surface areas of soil clays can be determined by adsorption of cetyl pyridinium bromide (CPB) from solution. T h e method is best used with peroxidized, air-dry samples which have been treated with dithionite-citrate-bicarbonate to remove iron and some aluminium oxides, and made homo-ionic with respect to the exchangeable cation. Apparent CPB areas derived from the plateau of the CPB adsorption isotherm agree with nitrogen areas when no expanding lattice material is present in the sample and when no large proportion of oxides of low surface density of charge remain after the dithionite treatment. When expanding lattice material is present CPB can provide an accurate measure of the internal surfaces provided that the external area is determined independently. Real variations in the crystal size, and hence ratio of external to internal area, are found with montmorillonite, and are exceptionally large for Wyoming bentonite. Specific surface areas determined by the ethylene glycol adsorption method agree reasonably well with areas of non-expanding lattice clays determined by CPB and nitrogen provided that the specific surface coverage by each adsorbed ethylene glycol molecule is taken as 23A2. When expanding lattice material is present the agreement is less satisfactory, but is improved in most instances by correcting the area on the basis that molecules adsorbed on external surfaces cover 23A2 but those on internal surfaces cover 46A2. Within the range of surface densities of charge found for mica-type materials the adsorption of CPB is much less sensitive to differences than is ethylene glycol, and therefore enables surface areas to be determined more accurately. CPB is also considerably more convenient to use, since well-defined adsorption plateaux are formed after overnight shaking.

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